NAME

Data::Stream::Bulk::Util - Utility functions for Data::Stream::Bulk

SYNOPSIS

use Data::Stream::Bulk::Util qw(array);

use namespace::clean;

# Wrap a list in L<Data::Stream::Bulk::Array>
return bulk(qw(foo bar gorch baz));

# return an empty resultset
return nil();

DESCRIPTION

This module exports convenience functions for use with Data::Stream::Bulk.

EXPORTS

Sub::Exporter is used to create the import routine, and all of its aliasing/currying goodness is of course supported.

nil

Creates a new Data::Stream::Bulk::Nil object.

Takes no arguments.

bulk @items

Creates a new Data::Stream::Bulk::Array wrapping @items.

cat @streams

Concatenate several streams together.

Returns nil if no arguments are provided.

filter { ... } $stream

Calls filter on $stream with the provided filter.

unique $stream

Filter the stream to remove duplicates.

Note that memory use may potentially scale to O(k) where k is the number of distinct items, because this is implemented in terms of a seen hash.

In the future this will be optimized to be iterative for sorted streams.

References are keyed by their refaddr (see "id" in Hash::Util::FieldHash).

AUTHOR

Yuval Kogman <nothingmuch@woobling.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2010 by Yuval Kogman.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.